The supermodel is welching on a lucrative, split-the-proceeds agreement, says the Miami-and-London-based group that did the design and marketing work for her fragrance and cosmetics line, according to a lawsuit filed today in Manhattan.

The supermodel is making millions and millions — though mostly in Europe — on such fragrances as “Cat Deluxe,” “Cat Deluxe with Kisses,” “Cat Deluxe at Night” and “Seductive Elixir,” the lawsuit says.

But last year, after seven years of forking over their contractually-required, quarterly cut, Naomi allegedly stopped payments.

Eaux de ingratitude!

“The perfume did well, and she basically sounds like she got tired of sharing the money with the people who put this together for her,” said lawyer Daniel Bright, who represents the aggrieved party — a company called Moodform Mission, based in London and Miami.

Moodform Mission designed everything from the original concept to the bottles and packaging, the lawyer said, and then did years of marketing before convincing a subsidiary of Proctor & Gamble to do the manufacturing.

When Moodform asked Proctor & Gamble why the checks had stopped, they said ask the supermodel, the lawyer told The Post.

“When my client said, “Why?” they said “Talk to Naomi — her people say we shouldn’t pay anymore,” Bright said.

Bright said a confidentiality agreement barred him from saying — even in the lawsuit — how much money Moodform Mission has lost.